EVIDENCE FOR SUPERLOCALIZATION ON A FRACTAL NETWORK IN CONDUCTIVE CARBON-BLACK POLYMER COMPOSITES

被引：125

作者：

VANDERPUTTEN, D ^{[1
]}

MOONEN, JT ^{[1
]}

BROM, HB ^{[1
]}

BROKKENZIJP, JCM ^{[1
]}

MICHELS, MAJ ^{[1
]}

机构：

[1] KONINKLIJKE SHELL EXPTL PROD LAB, 1003 AA AMSTERDAM, NETHERLANDS

来源：

PHYSICAL REVIEW LETTERS | 1992年 / 69卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.69.494

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The dc conductivity of carbon-black-polymer composites has been measured as a function of carbon-black concentration from just above the percolation threshold p(c) up to 33p(c), and in the temperature range from 4 to 300 K. To explain the temperature dependence we have modified the Mott-Deutscher model for variable-range hopping between superlocalized states on a fractal by assuming Coulomb-dominated hopping. Our data then yield the first experimental evidence of electron superlocalization, with a superlocalization exponent zeta = 1.94 +/- 0.06, close to theoretical estimates. The derived localization length is of the right order of magnitude.

引用

页码：494 / 497

页数：4

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